<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="base.js">

    </script>
    <script>
        console.log("nihao")
        console.log("草泥马")
    </script>

</head>
<body>


<button onclick=" console.log('Hello world!')">这是一个按钮</button>




</body>
</html>